1. Pokonza magetsi owonetsera mawonekedwe a LED, choyamba tifunika kugwiritsa ntchito multimeter kuti tiwone ngati pali chozungulira chachifupi pa chipangizo chilichonse chamagetsi, monga mlatho wokonzanso mphamvu, chubu chosinthira, chubu chapamwamba champhamvu chamagetsi. , komanso ngati chotsutsa champhamvu kwambiri chomwe chimapondereza mawotchi othamanga chiwotchedwa.Kenako, tiyenera kuwona ngati kukana kwa doko lililonse lamagetsi ndikovuta.Ngati zipangizo zomwe zili pamwambazi zawonongeka, tiyenera kuzisintha ndi zatsopano.

2. Mukamaliza mayesero omwe ali pamwambawa, ngati magetsi akuyatsidwa ndipo sangathe kugwira ntchito bwino, tiyenera kuyesa gawo la mphamvu (PFC) ndi gawo la pulse width modulation component (PWM), fufuzani zambiri zofunikira, ndikuzidziwa bwino. ntchito za pini iliyonse ya PFC ndi PWM modules ndi zofunikira pa ntchito yawo yachibadwa.

3. Kwa magetsi omwe ali ndi dera la PFC, m'pofunika kuyeza ngati voteji pamapeto onse a fyuluta capacitor ndi pafupifupi 380VDC.Ngati pali magetsi pafupifupi 380VDC, zikuwonetsa kuti gawo la PFC likugwira ntchito bwino.Ndiye, m'pofunika kudziwa mmene ntchito gawo la PWM gawo, kuyeza mphamvu athandizira terminal VC, Buku voteji linanena bungwe terminal VR, kuyamba ndi kulamulira Vstart/Vcontrol terminal voteji, ndi ntchito 220VAC/220VAC kudzipatula thiransifoma kupereka mphamvu kwa anatsogolera kuwonetsera chophimba, Gwiritsani ntchito oscilloscope kuti muwone ngati mawonekedwe a PWM module CT kumapeto mpaka pansi ndi Sawtooth wave kapena triangle wave ndi mzere wabwino.Mwachitsanzo, TL494 CT end ndi Sawtooth wave wave, ndipo FA5310 CT end ndi triangle wave.Ndi mawonekedwe amtundu wotuluka V0 ndi chizindikiro chocheperako.

4. Pokonza magetsi owonetsera mawonekedwe a LED, magetsi ambiri owonetsera mawonekedwe a LED amagwiritsa ntchito UC38 × & Times;Zambiri mwa zigawo za 8-pin PWM pamndandanda sizigwira ntchito chifukwa cha kuwonongeka kwa kukana koyambira kwa magetsi kapena kuchepa kwa magwiridwe antchito a chip.Pamene palibe VC pambuyo poti R yathyoledwa, chigawo cha PWM sichingagwire ntchito ndipo chiyenera kusinthidwa ndi chotsutsa chokhala ndi mphamvu yotsutsa mphamvu yofanana ndi yoyamba.Pamene chiyambi cha gawo la PWM chikuwonjezeka, mtengo wa R ukhoza kuchepetsedwa mpaka gawo la PWM likhoza kugwira ntchito bwino.Pokonza magetsi a GE DR, gawo la PWM linali UC3843, ndipo palibe zolakwika zina zomwe zidapezeka.Pambuyo polumikiza 220K resistor ku R (220K), gawo la PWM linagwira ntchito ndipo mphamvu yotulutsa mphamvu inali yachilendo.Nthawi zina, chifukwa cha zolakwika zozungulira, voteji ya 5V kumapeto kwa VR ndi 0V, ndipo gawo la PWM siligwira ntchito.Pokonza mphamvu ya kamera ya Kodak 8900, izi zimakumana.Dera lakunja lolumikizidwa ndi VR kumapeto limachotsedwa, ndipo VR imasintha kuchokera ku 0V kupita ku 5V.Chigawo cha PWM chimagwira ntchito bwino ndipo mphamvu yotulutsa ndi yachilendo.

5. Pamene palibe magetsi ozungulira 380VDC pa capacitor yosefera, zimasonyeza kuti dera la PFC silikugwira ntchito bwino.Zikhomo zodziwikiratu za gawo la PFC ndi pini yolowera VC, pini yoyambira Vstart/control, CT ndi RT pin, ndi V0 pin.Mukakonza kamera ya Fuji 3000, yesani kuti palibe magetsi a 380VDC pa fyuluta capacitor pa bolodi limodzi.VC, Vstart/control, CT ndi RT waveforms komanso V0 waveforms ndizabwinobwino.Palibe mawonekedwe a V0 pa G pole ya gawo loyezera mphamvu yosinthira mphamvu.Popeza FA5331 (PFC) ndi chigamba, patatha nthawi yayitali yogwiritsa ntchito makinawo, pali kusolder kolakwika pakati pa V0 ndi bolodi, ndipo chizindikiro cha V0 sichimatumizidwa ku G pole ya Field-effect transistor. .Weld the V0 kumapeto kwa solder pa bolodi, ndipo gwiritsani ntchito multimeter kuyeza 380VDC voliyumu ya capacitor yosefera.Pamene Vstart/control terminal ili pamlingo wocheperako wamagetsi ndipo PFC siyitha kugwira ntchito, ndikofunikira kuzindikira mabwalo oyenera olumikizidwa ndi periphery kumapeto kwake.